In the 1989 Hollywood blockbuster "Back to the Future II," October 21, 2015, is the day to which Marty McFly time travels in a DeLorean car to make changes to prevent bad things from happening to his children.

Now that the day has arrived, some of the White House hopefuls are jumping on the publicity surrounding it to make their case for change.

The Marco Rubio campaign released a video with clips of Bill Clinton and Joe Biden that cautions against going "back to the past."

"The video shows a sharp generational contrast between Marco's approach to solving the challenges of the 21st century with conservative and innovative solutions, and the outdated policies of Hillary Clinton and Joe Biden," the email said.

Carly Fiorina's campaign also sent an email Wednesday -- with the subject line "I need your help to change the future #BTTF" -- warning that electing the wrong president could lead to a future of high unemployment, exorbitant taxes, and government overreach.

"We need Carly Fiorina to change the course of history and bring us back to a future of strength and prosperity," reads the email, which also has a video with a "Back to the Future"-themed story line featuring characters committed to saving the future.

GOP hopeful Chris Christie tweeted about the day, noting how Social Security spending has risen since the first "Back to the Future" movie was released 30 years ago.

One of the White House candidates -- Donald Trump -- has similarities to Biff Tannen, a blonde, arrogant bully who builds a fortune as a casino magnate and uses his wealth to influence politics, according to "Back to the Future II" writer Bob Gale.

"We thought about it when we made the movie! Are you kidding?" Gale told the Daily Beast.

The White House got into the "Back to the Future" spirit, too - but avoided politics.

It released a letter from Michael J. Fox -- the star of the film -- about the promises that the future has in store.

"Call me an optimist, but I believe that by 2045 we'll find the cures we seek -- especially because of all the smart, passionate people working to make it happen," said Fox, who has Parkinson's disease, a degenerative disorder of the central nervous system.

"Doctors and researchers around the world are developing new tools to improve the diagnosis and treatment of brain diseases, to tailor treatments -- for all illnesses -- through precision medicine, and to make life better for millions of people. This truly is the stuff of the future," he said.